Explain how to leverage the WordPress REST API to build a headless application, and describe how to retrieve and manipulate data.

Leveraging the WordPress REST API to build a headless application involves decoupling the front-end presentation layer from the back-end data management system. In a traditional WordPress site, the front-end (themes) and the back-end (WordPress core) are tightly coupled. However, with a headless approach, WordPress becomes solely a content repository, with the REST API serving as the primary mechanism for interacting with and retrieving data for a completely separate front-end application, which can be built using frameworks like React, Angular, or Vue.js, or even a mobile application. To begin using the REST API, we first need to understand the basic structure of API endpoints. Each endpoint corresponds to a particular type of data or action. For example, the default endpoint for posts is `/wp-json/wp/v2/posts`. To retrieve all posts from your WordPress site, you would make a GET request to this endpoint. A typical request might look like this: `https://example.com/wp-json/wp/v2/posts`. The response from this request is a JSON object containing an array of posts. Each post object includes various fields such as `id`, `title`, `content`, `date`, `author`, and `categories`. Using JavaScript on the front-end, you can make an HTTP request using `fetch` or `axios` to retrieve the data from this API....